select an item in gridview

[ptvce]

I have a gridview with a checkbox column, i select a checkbox in a row and click edit button after that, edit button click_event i wrote this: grvWorkDetail.DataKeys[grvWorkDetail.SelectedIndex].Values["WorkTimeID"].ToString() but it has error, and i cant access to "WorkTimeID" my codebehind is :

<asp:TemplateField ItemStyle-VerticalAlign="Middle" ItemStyle-HorizontalAlign="Center">
<HeaderTemplate>
<asp:CheckBox ID="chk_SelectAll" runat="server" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chk_Select" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-HorizontalAlign="Center"

[Lost User]

Please do not post the same question in multiple forums.

One of these days I'm going to think of a really clever signature.